bump: bump up go.mod module

[ghost]

This PR bumps up go.mod module to github.com/notaryproject/notation/v2.

[JeyJeyGao]

LGTM

[shizhMSFT]

LGTM

[Copilot]

Pull Request Overview

This PR updates the reference to the go.mod module for the notation project from github.com/notaryproject/notation to github.com/notaryproject/notation/v2. The changes update the import paths across various packages such as blob commands, certificate commands, display handlers, policy imports, and tests.

• Updated import paths for multiple packages to use the new v2 module.
• Adjusted references in command files, internal display packages, tests, and policy imports.

Reviewed Changes

Copilot reviewed 59 out of 59 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cmd/notation/blob/cmd.go	Updated blob policy import to v2
cmd/notation/internal/display/metadata/json/inspect.go	Updated output import to v2
cmd/notation/cert/add.go	Updated truststore import to v2
cmd/notation/blob/verify.go	Updated imports for display, flag, verify, and envelope to v2
cmd/notation/cert/delete.go	Updated truststore import to v2
cmd/notation/inspect.go	Updated imports for display, errors, and flag to v2
cmd/notation/blob/inspect.go	Updated imports for display, output, and flag to v2
cmd/notation/blob/sign_test.go	Updated flag and envelope imports to v2
cmd/notation/internal/display/metadata/text/blobverify.go	Updated display output import to v2
cmd/notation/internal/display/handler.go	Updated metadata and output imports to v2
cmd/notation/inspect_test.go	Updated display output and flag imports to v2
cmd/notation/blob/policy/import.go	Updated display and osutil imports to v2
cmd/notation/internal/display/metadata/json/blob_inspect.go	Updated output import to v2
cmd/notation/cert/generateTest.go	Updated truststore and osutil imports to v2
cmd/notation/cert/show.go	Updated flag and truststore imports to v2
cmd/notation/blob/sign.go	Updated imports for display, flag, sign, envelope, httputil, osutil, revocation, and x509 to v2
cmd/notation/cert/list.go	Updated flag and truststore imports to v2
cmd/notation/blob/policy/init.go	Updated display, output, and osutil imports to v2
cmd/notation/internal/display/metadata/json/inspect_helper.go	Updated envelope import to v2

[JeyJeyGao]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.46%. Comparing base (7d8e4e1) to head (9785b4e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1216   +/-   ##
=======================================
  Coverage   76.46%   76.46%           
=======================================
  Files          67       67           
  Lines        3696     3696           
=======================================
  Hits         2826     2826           
  Misses        671      671           
  Partials      199      199           

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